[pymvpa] search-light vs. ROI analysis: significance puzzle

Malin Björnsdotter malin.bjornsdotter at neuro.gu.se
Tue Feb 26 12:10:52 UTC 2013

Hi! It is indeed lovely, I rarely have the patience for exhaustive
searches at all (the results are (quantitatively) the same anyway (and
qualitatively better)). I'm afraid I only have Matlab code though, and
I'm not fluent enough in neither Python nor PyMPVA to implement it.
(Yet.) ~Malin

On Tue, Feb 26, 2013 at 8:02 PM, Michael Hanke <michael.hanke at gmail.com> wrote:
> Hi,
> does anyone have Python code for putting this as a feature into PyMVPA's
> searchlight. In this past I have been using the 'scatter ROIs' feature
> quite a bit to speed up analysis and get a the big picture faster. It would
> be lovely to have this way of representing the results combined with
> scattering of searchlights.
> Michael
> On Tue, Feb 26, 2013 at 12:47 PM, Malin Björnsdotter
> <malin.bjornsdotter at neuro.gu.se> wrote:
>> > In my method, the hitrate is assigned to all the
>> > voxels in the light and given that each voxel participates in many
>> > lights,
>> > the hitrates are averaged. So, using my method a voxel hitrate reflects
>> > many
>> > possible environments. I try to compare the results of both and so far
>> > it
>> > seems that with your method the results are more patchy.
>> That sounds pretty much exactly as what I've been doing. :-) Jo has an
>> excellent blog entry about this:
>> http://mvpa.blogspot.sg/2012/09/random-searchlight-averaging.html
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> --
> GPG key:  1024D/3144BE0F Michael Hanke
> http://mih.voxindeserto.de
> Jabber: michael.hanke at gmail.com

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